1969

7.6

1962

7.0

1956

7.3

1997

6.5

1989

6.0

1990

7.5

1953

8.0

1948

3.7

2005

6.1

1956

6.6

1940

5.8

1996

6.6

1997

5.7

1998

7.2

1984

7.2

2003

5.6

1926

7.9

1975

5.8

1998

5.4

1961

5.7